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Inventories Schedule of Inventory (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Sep. 01, 2017
Inventory [Line Items] |  |  |  |  |  |
Finished Products | $ 2,103 | $ 2,611 | $ 2,103 | $ 2,611 | $ 3,022 |
Semi-finished Products | 1,373 | 1,401 | 1,373 | 1,401 | 1,821 |
Raw Materials | 228 | 209 | 228 | 209 | 191 |
Stores and Supplies | 214 | 141 | 214 | 141 | 276 |
Total | 3,918 | 4,362 | 3,918 | 4,362 | $ 5,310 |
Merger with Dow [Member] |  |  |  |  |  |
Inventory [Line Items] |  |  |  |  |  |
Business Combination, Fair Value Step Up Of Acquired Inventory |  |  |  |  |  | $ 2,297
Business Combination, Fair Value Step-Up Of Acquired Inventory, Amount recognized in Cost of Goods sold | $ 52 | $ 676 | $ 257 | $ 1,315 |  |

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